Add a few redirects.

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.3)
+    concurrent-ruby (1.1.4)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -29,6 +29,8 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
+    jekyll-redirect-from (0.14.0)
+      jekyll (~> 3.3)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-sitemap (1.2.0)
@@ -46,8 +48,8 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (3.0.3)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rouge (3.3.0)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
@@ -63,7 +65,8 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 3.8.5)
+  jekyll-redirect-from (~> 0.14.0)
   jekyll-sitemap (~> 1.2.0)
 
 BUNDLED WITH
-   1.17.2
+   1.17.3